If I'm finished in the early side, I'll call in and check before driving back to the station. If I do get sent out again, I'm still back before some of the others. Plus I don't get the slits left on the floor.

Hindering the delivery of mail is a crime. You may want to ask for some ropes or a gate to close off the mail area until you are done with delivering. At that time they can be allowed to retrieve their mail.